======================================================
WARNING: possible circular locking dependency detected
5.4.0-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.0/18427 is trying to acquire lock:
ffff88808cd6a500 (&rp->fetch_lock){+.+.}, at: mon_bin_vma_fault+0x73/0x2d0 drivers/usb/mon/mon_bin.c:1237
but task is already holding lock:
ffff88808b440e58 (&mm->mmap_sem#2){++++}, at: __mm_populate+0x270/0x380 mm/gup.c:1251
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&mm->mmap_sem#2){++++}:
__might_fault mm/memory.c:4524 [inline]
__might_fault+0x15e/0x1e0 mm/memory.c:4509
_copy_to_user+0x30/0x160 lib/usercopy.c:26
copy_to_user include/linux/uaccess.h:152 [inline]
mon_bin_get_event+0x117/0x450 drivers/usb/mon/mon_bin.c:756
mon_bin_ioctl+0xacf/0xc80 drivers/usb/mon/mon_bin.c:1068
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:509 [inline]
do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
__do_sys_ioctl fs/ioctl.c:720 [inline]
__se_sys_ioctl fs/ioctl.c:718 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #0 (&rp->fetch_lock){+.+.}:
check_prev_add kernel/locking/lockdep.c:2476 [inline]
check_prevs_add kernel/locking/lockdep.c:2581 [inline]
validate_chain kernel/locking/lockdep.c:2971 [inline]
__lock_acquire+0x2596/0x4a00 kernel/locking/lockdep.c:3955
lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4485
__mutex_lock_common kernel/locking/mutex.c:959 [inline]
__mutex_lock+0x156/0x13c0 kernel/locking/mutex.c:1106
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1121
mon_bin_vma_fault+0x73/0x2d0 drivers/usb/mon/mon_bin.c:1237
__do_fault+0x111/0x540 mm/memory.c:3166
do_cow_fault mm/memory.c:3592 [inline]
do_fault mm/memory.c:3694 [inline]
handle_pte_fault mm/memory.c:3923 [inline]
__handle_mm_fault+0xc6a/0x3f00 mm/memory.c:4047
handle_mm_fault+0x3b2/0xa50 mm/memory.c:4084
faultin_page mm/gup.c:640 [inline]
__get_user_pages+0x7cf/0x1ae0 mm/gup.c:845
populate_vma_page_range+0x20d/0x2a0 mm/gup.c:1223
__mm_populate+0x204/0x380 mm/gup.c:1271
mm_populate include/linux/mm.h:2357 [inline]
vm_mmap_pgoff+0x213/0x230 mm/util.c:501
ksys_mmap_pgoff+0x4aa/0x630 mm/mmap.c:1629
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline]
__x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&mm->mmap_sem#2);
lock(&rp->fetch_lock);
lock(&mm->mmap_sem#2);
lock(&rp->fetch_lock);
*** DEADLOCK ***
1 lock held by syz-executor.0/18427:
#0: ffff88808b440e58 (&mm->mmap_sem#2){++++}, at: __mm_populate+0x270/0x380 mm/gup.c:1251
stack backtrace:
CPU: 0 PID: 18427 Comm: syz-executor.0 Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x197/0x210 lib/dump_stack.c:118
print_circular_bug.isra.0.cold+0x163/0x172 kernel/locking/lockdep.c:1685
check_noncircular+0x32e/0x3e0 kernel/locking/lockdep.c:1809
check_prev_add kernel/locking/lockdep.c:2476 [inline]
check_prevs_add kernel/locking/lockdep.c:2581 [inline]
validate_chain kernel/locking/lockdep.c:2971 [inline]
__lock_acquire+0x2596/0x4a00 kernel/locking/lockdep.c:3955
lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4485
__mutex_lock_common kernel/locking/mutex.c:959 [inline]
__mutex_lock+0x156/0x13c0 kernel/locking/mutex.c:1106
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1121
mon_bin_vma_fault+0x73/0x2d0 drivers/usb/mon/mon_bin.c:1237
__do_fault+0x111/0x540 mm/memory.c:3166
do_cow_fault mm/memory.c:3592 [inline]
do_fault mm/memory.c:3694 [inline]
handle_pte_fault mm/memory.c:3923 [inline]
__handle_mm_fault+0xc6a/0x3f00 mm/memory.c:4047
handle_mm_fault+0x3b2/0xa50 mm/memory.c:4084
faultin_page mm/gup.c:640 [inline]
__get_user_pages+0x7cf/0x1ae0 mm/gup.c:845
populate_vma_page_range+0x20d/0x2a0 mm/gup.c:1223
__mm_populate+0x204/0x380 mm/gup.c:1271
mm_populate include/linux/mm.h:2357 [inline]
vm_mmap_pgoff+0x213/0x230 mm/util.c:501
ksys_mmap_pgoff+0x4aa/0x630 mm/mmap.c:1629
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline]
__x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a679
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f7892bf5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000045a679
RDX: 0000000001000002 RSI: 0000000000400300 RDI: 0000000020a05000
RBP: 000000000075bf20 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000008012 R11: 0000000000000246 R12: 00007f7892bf66d4
R13: 00000000004c70fe R14: 00000000004dd148 R15: 00000000ffffffff